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josephkoenig28

Lexus ES Stalling at Idle

2016 Lexus ES gasoline engine, 186k km. Check engine light, stalls at idle, reduced power. Suspect fuel pressure regulator after fuel filter change. Is this plausible? Fuel pump seems fine.

Summary of the thread

A 2016 Lexus ES with 186,000 km is experiencing stalling at idle, reduced power, and a check engine light. The initial suspicion is a faulty fuel pressure regulator, especially after a fuel filter change, while the fuel pump appears to be functioning correctly. A static fuel pressure test showed normal results, but dynamic testing under load is suggested to confirm if the regulator is failing intermittently. Ultimately, a defective fuel pressure regulator is confirmed as the cause, guided by an error code at a workshop.

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4 comment(s)

hannahlorenz1

I have an ES too, and those symptoms sound eerily familiar. I had similar issues and it felt like the engine was trying to breathe through a straw. Did you check the fuel pressure itself? A faulty regulator can cause all sorts of havoc.

josephkoenig28 (community.author)

Fuel pressure was within spec during a static test, but I haven't monitored it dynamically under load. Could a partially failing regulator cause these intermittent issues, even with seemingly normal static pressure?

hannahlorenz1

Absolutely. Think of it like this: a garden hose with a kink. It might seem okay at low flow, but try to water the whole garden at once, and the pressure drops. A dynamic test is crucial; it's the only way to see if the regulator can keep up when the engine demands more fuel. Better take it to a workshop, they are better equipped for this.

josephkoenig28 (community.author)

Confirmed. Defective fuel pressure regulator. Error code pointed the workshop in the right direction. 45€. Thanks for the advice.

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LEXUS

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ES